Numerical and experimental methodologies to investigate the damage progression inside the axisymmetric composite cylinders with cutouts under torsion

Official URL: https://dx.doi.org/10.1016/j.compstruct.2023.116990

Torsional performance and damage progression inside the long and hollow axisymmetric composite cylinders with different cutouts sizes are investigated via experimental and numerical methods. Acoustic emission, Digital image correlation, and Infrared thermography are deployed to investigate failure propagation. Four acoustic sensors adhere to different locations, and the frequency-based analysis is performed for the damage classification. The cumulative energy data of each sensor is correlated with the nearby strain gauge data to identify the cause of failure. Among all the classified failure types, the predominant failure is matrix cracking which is caused by shear stresses. The percentage of each failure type varies at different locations of the cylinder, and global failure is caused by the simultaneous occurrence of these failure events. Thermography analysis measures the temperature change due to the failure and provides the imprints of the failure initiated by certain damage activities. The thermograms reveal the damage propagation around the cutout and post-global failure postmortem. A material degradation-based progressive damage analysis is performed through Ansys APDL using Hashin failure criteria. The reliability of the performed study is exhibited by comparing the full-field displacement maps and torque-rotation curves of the experimental and numerical analysis.